Spieth rounding into familiar form at just the right time

If recent history is any indication, Jordan Spieth is trending in the right direction heading into the final major of the year.

Spieth closed with a 4-under 66 on Sunday at the Bridgestone Invitational, his last round before heading to Whistling Straits for the PGA Championship.

Spieth had a 70 and lost in a playoff at the Shell Houston Open the week before he won the Masters.